Unrooted neighbor-joining dendrogram of COI haplotype sequences from throughout the natural range of Callinectes sapidus showing three lineages: blue, Lineage 1 (predominantly northwestern Atlantic and Gulf of Mexico); pink, Lineage 2 (predominantly Caribbean region); orange, Lineage 3 (Brazil only). Tip labels are haplotype number and collection region. MAB, Mid-Atlantic Bight; SAB, South Atlantic Bight; GMx, Gulf of Mexico; CAR, Caribbean region; BR, Brazil.